macomber



(No Model.) 2 Sheets-Sheet 1;

,1 1. MACOMBER. AUTOMATIC STOP MOTION FOR PUNOHING AN D FORMING PRESSES. No. 292,756. Patented Jan 29 1884.

WITNEEEEE. INVEIN TIIIH.

(No Model.) 7 v7 2 SheetsSheet 2.

' w. 1. MACOMBER.

AUTOMATIC STOP MOTION FOR PUNGHING AND FORMING PRESSES. No. 292,756. Patented Jan. 29, 1884.

n. PETERQ muwunwmv mini um a c UNIT STATES \VlLLIAM I. MACOMBER, OF PROVIDENCE, RHODE ISLAND,

ASSIGNOR TO GEORGE L. VOSE, OF SAME PLACE.

AUTOMATIC STOP-MOTION FOR PUNCHING AND FORMING PRESSES.

SPECIFICATION forming part of Letters Patent No. 292,756, dated January 29, 1884.

. Application filed august 31, 1883. (No model.)

finished article is not properly dischargedfrom the machine; and it consists in the improved combination of devices, as hereinafter fully set forth. V Figure 1 is a front elevation of a power-press provided with my improvement. Figs. 2, 3, 4., 5, and 6- are detail views of the same.

In the accompanying drawings, A is the frame of the press; B, the shaft; O O, cranks for operating the sex eral tools, and D the driving-pulley, which is made to turn loosely upon the shaft B, and iscaused to impart rotation to the shaft by means of a sliding clutch, held in locking engagement with the pulley D by means of a spring, and withdrawn from engagement wit 1 the pulley D by means of the spring-operate bar E, provided at its upper end with the cani e, as usual in such machines.

- The bar E is held loosely in the guides a a of the frame, and is forced upward by means of the spiral spring F,-and when drawn down ward, thus causing the release of the springclutch for starting the machine in operation, it will be held in position by means of the pivoted pawl G, the point of which enters a notch, g, in the side of the bar E, and thespring h will serve to force the pawl into the notch. Either a handle or a pedal may be attached to the bar E, in order that the same may-be operated to start the machine. Connection is made by means of the chain H, passing around the pulleys b b to the eye c, which is screwed into the armI and firmly held therein by means of the check-nut (l. The arm I is arranged to slide upon the hollow cylindrical bar J and is forced upward thereon by means of the spiral spring f. It is also held at its lower position, in opposition to the upward 'action of the spring, by means of the bolt '17, which is drawn backward to release the arm I by means of the spiral spring j. (Shown in the' secti0n,'Fig. 4.) The bar K, beveled at its lower end for action upon the head of the bolt '5, and passing loosely-through the contraction Z in the bore of the bar J, is forced upward by means of the spiral spring 7c.

Passing laterally through the upper end of the slide J is arranged the shaft L, upon which, within the boreof the slide J, is placed the eccentric M, so arranged with the bar K that the upward pressure of-the bar, resulting from the resilience of the spring K, will be sufficient to cause a partial rotation of the shaft L.

Upon the side of the support M for the slide is secured the pawl O, pivoted at the point m,

and adapted to engage with the notch a, made in an enlargement of the shaft L. The weighted arm 0 of the pawl O is provided with a projecting lip, 19, adapted'to receive the proper action of the lever P, which partakes of the up-and-d0wn movement of the formingtool Q, which is made hollow and provided with a loose central spindle, q, having a collar, 1", above which is placed the spiral spring 8, adapted to resist the upward movement of the spindle. The upper end of the spindle passes loosely through the bushingt, at the upper end of which rests the adjusting-screw a, held in the short arm of the lever P, pivoted upon the pin 12, Fig. 3, and held against the upper end of tlie forming-tool Q and bushing. t by means of the spring 10. The formingtool Q is held, by means of the screw :20, in the holder S, which is attached by means of the screw 1 to the sliding head of the press.

The operation of the stop-motion will be as follows: The arm I is to be first forced down ward against the action ofthe spiral spring' to the position shown in Figs. 1 and 4. A

1 will just touch the upper surface of the pro:

jecting lip p of the pawl O. The machine is now to be started by drawing down the bar E until the pawl G enters the notch gin the bar, thus retaining the bar E in its extreme downward position until released either by the hand of the operator or by the automatic action of the machine. The press shown in the drawings is provided with three sets of tools at the upper side of the die-pl ate, and the piece of metal to be operated upon is made to pass successively under the action of each of them by suitably-arranged means.

In the manufacture of hollow beads from sheet metal, the blank is first cut out and made in cup form by means of the tools V and X, the latter moving through the former and serving to force the cut blank between suitable jaws for transmission to the tool Y,which serves to cut out the bottom of thepreviously-formed cup, and from which the perforated cup is carried to the forming-tool (Q, by means of which the upper end of the perforated cup is closed inward to a spherical form, thus finishing the bead upon the spindle g, from which it is to be removed by means of a suitably-arranged stripper upon the proper elevationof the sliding head of the press, to which the forming-tool Q is attached. N ow, in case of the failure "of the stripper to remove the finished bead from the spindle (1, then the subsequent stroke of the press will cause another bead to be placed on the spindle, and the two so placed will cause the derangement of the machine; but with my 0 improvement, when two beads are placed upon 1) of the pawl (),will serve to throw the pawl I out of thenotch 11 thus allowing the bar K to move upward under the action of the spring is, and causing the sinmltaneons inward movement of the bolt 'i,which will release the sliding arm I and cause it to be carried upward by means of the springf, and this upward move ment of the arm I will be transmittedby means of the chain II to the pawl G, causing its elevation from the notch r and the consequent re lease of the spring-operated shipper-bar E,

which will also cause the withdrawal of the clutch from the drivingpulley, and thus stop the movement of the press.

It is to be understood that my invention is not restricted to presses constructed for the manufacture of beads, but may be applied to presses adapted for the manufacture of various other articles.

I claim as my invention- 1. The combination of the tool Q, spindle q, spring 8, pivoted lever 1, and holder S, substantially as and for the purpose specified.

2-. The combination of the shaft L, pawl 0, provided with a projecting lip,p, eccenlricM, bar K, spring 7:, bolt 1", and spring j, with a sliding arm, I, spring f, connecting-chain H, pivoted pawl G, and spring-operated clutchshipper 1*], substantially as described.

XVILLIAM I. MACOMBER.

*itnesses:

Gnonon L. Vosn, SoenA'rns Son'otrncm). 

